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Meiling Yang, Fang Li, Hong Long, Weiwei Yu, Xiuna Yan, Bin Liu, Yunxiu Zhang, Guorong Yan and Wenqin Song

As a wild apple species native to central Asia, Malus sieversii (Ledeb.) Roem. is distributed in a wide region covering most of the Tienshan Mountains. Malus sieversii is a useful genetic pool for apple breeding since rich with diversity. In this paper, we first describe the species range of this endangered species. We then describe an in situ reserve that has been established. We also investigated some reproductive characteristics of M. sieversii including pollen germination, seed dormancy, and seed viability. Both stratification and seedcoat removal efficiently released seed dormancy and accelerated seed germination. Pollen germination rate is around 60%. Our data suggest that injurious insects and human activities, rather than reproductive characters, limit the renewal of M. sieversii.

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María del Carmen Vadillo-Pro, Luis Hernández-Sandoval, Guadalupe Malda-Barrera, María Luisa Osorio-Rosales and Martín Mata-Rosas

potential to produce up to 50 new plants through direct organogenesis. Additionally to in situ protection measures, conservation of endangered species such as B. purpusii should be enhanced by ex situ alternatives. For this reason the Mexican Government